Rubus × 'NY 15826' is an experimental blackberry selection developed at the New York State Agricultural Experiment Station by Cornell University, resulting from the controlled hybridization of the cultivars 'Eldorado' and 'Brewer'. This cross was designed to combine the legendary cold-hardiness and vigorous growth of 'Eldorado'—a variety discovered in Ohio in the 1880s—with the high-quality fruit characteristics and productivity of 'Brewer'. While 'Eldorado' contributed a robust genetic resistance to orange rust and a tendency for self-supporting canes, 'Brewer' provided a genetic boost to fruit size and sweetness, making the 'NY 15826' selection a significant subject for studying regional adaptation in Northern temperate climates.

The fruit produced by this hybrid is characterized by large, glossy drupelets and a complex flavor profile that balances a sharp acidity with a deep, vinous sweetness. In gastronomic ethnobiology, 'NY 15826' is noted for its high concentration of pigments that provide its intense coloration and serve as biological markers for the Rubus genus. These compounds contribute to the astringency and "health-protective" reputation of the berry.